bo jacobs talks about how this generation was the first generation that learned to live in a nuclear war. you can see where it is a quote from one of the folks at the indian springss school in nevada which is next to an air force base. it is a two-room school, and they're not being taught to duck and cover but duck, and i guess, hold one another. this was on the cover of a magazine and the person from the school was boasting that they learned how to spell atom and bomb before they learned how to spell mother. to kind of imagine that shift, right, in learning those words that had much bigger social and cultural meaning and were certainly more scary than the word mother. the federal government was interested in educating a lot of civilians, but in particular a lot of children in the procedures of civil defense, in what are the actual threats of an atomic attack, what would it look like. they devised this film called "duck and cover." what we're going to do here is watch a small clip of the introduction to "duck and cover," featuring the theme song. ♪ and danger ♪ never got hurt ♪ he kn

so bo jacobs talks about how this generation was the first generation that learned to live in a nuclear world, and you can see the folks from the indian springs school in nevada which is next to an air force base, right? it's a two-room school, and and duck and hold one, and they learned how to spell atom and bomb before they learned how to spell mother. just imagine that shift and learning those words that had much bigger and more than the word mother. in particular, a lot of children in the procedures of civil defense in what are the actual threats of an atomic attack. what would it look like? and so they devised this film called duck and cover. what we'll do here is watch a small clip of the introduction to "duck and cover" featuring the theme song. ♪ ♪ ♪ a major threat and he never got hurt ♪ ♪ he knew just what to do ♪ he's duck and cover ♪ duck and cover ♪ he did what we all must learn to do ♪ ♪ you and you and you and you ♪ duck and cover >> be sure and remember what bert the turtle did because every one of us must remember to do the same thing. that's what this film is all about

bo privileges. yet you do have to pay taxes. but we don't get treated the same. >> reporter: for a generation of immigrants, everyday life now interrupted and a six-month countdown begins. jacob soboroff, nbc news. >>> tonight a new show of force and new threats from north korea as the u.s. keeps a close eye for another provocation after north korea's most powerful tests by far claiming to have exploded a hydrogen bomb which would be another rapid advance in kim jong-un's nuclear arsenal. our chief foreign correspondent richard engel has the latest from south korea. >> reporter: south korea today baring its teeth at north korea. in live fire drills that are now almost daily. north korea making threats, too, at the u.s. warning more, quote, gift packages will be heading toward the united states. north korea has already fired 18 missiles this year in violation of u.n. resolutions and south korea expects another missile test perhaps this saturday. just after north korea detonated what japan said today probably was a hydrogen bomb. the trajectory of the expected test launch will be key. if it's fired east toward or over japan, little change. it's happened before. but if it's fire